Evidence for the weakly coupled electron mechanism in an Anderson-Blount polar metal
Abstract
Over 50 years ago, Anderson and Blount proposed that ferroelectric-like structural phase transitions may occur in metals, despite the expected screening of the Coulomb interactions that often drive polar transitions. Recently, theoretical treatments have suggested that such transitions require the itinerant electrons be decoupled from the soft transverse optical phonons responsible for polar order. However, this decoupled electron mechanism (DEM) has yet to be experimentally observed. Here we utilize ultrafast spectroscopy to uncover evidence of the DEM in LiOsO3, the first known band metal to undergo a thermally driven polar phase transition (Tc ≈ 140 K). We demonstrate that intra-band photo-carriers relax by selectively coupling to only a subset of the phonon spectrum, leaving as much as 60% of the lattice heat capacity decoupled. This decoupled heat capacity is shown to be consistent with a previously undetected and partially displacive TO polar mode, indicating the DEM in LiOsO3.
- Authors:
- Publication Date:
- Research Org.:
- California Institute of Technology (CalTech), Pasadena, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1619645
- Alternate Identifier(s):
- OSTI ID: 1597627; OSTI ID: 1830823
- Grant/Contract Number:
- SC0012375; DE SC0010533; SC0010533
- Resource Type:
- Published Article
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Name: Nature Communications Journal Volume: 10 Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Laurita, N. J., Ron, A., Shan, Jun-Yi, Puggioni, D., Koocher, N. Z., Yamaura, K., Shi, Y., Rondinelli, J. M., and Hsieh, D. Evidence for the weakly coupled electron mechanism in an Anderson-Blount polar metal. United Kingdom: N. p., 2019.
Web. doi:10.1038/s41467-019-11172-2.
Laurita, N. J., Ron, A., Shan, Jun-Yi, Puggioni, D., Koocher, N. Z., Yamaura, K., Shi, Y., Rondinelli, J. M., & Hsieh, D. Evidence for the weakly coupled electron mechanism in an Anderson-Blount polar metal. United Kingdom. https://doi.org/10.1038/s41467-019-11172-2
Laurita, N. J., Ron, A., Shan, Jun-Yi, Puggioni, D., Koocher, N. Z., Yamaura, K., Shi, Y., Rondinelli, J. M., and Hsieh, D. Fri .
"Evidence for the weakly coupled electron mechanism in an Anderson-Blount polar metal". United Kingdom. https://doi.org/10.1038/s41467-019-11172-2.
@article{osti_1619645,
title = {Evidence for the weakly coupled electron mechanism in an Anderson-Blount polar metal},
author = {Laurita, N. J. and Ron, A. and Shan, Jun-Yi and Puggioni, D. and Koocher, N. Z. and Yamaura, K. and Shi, Y. and Rondinelli, J. M. and Hsieh, D.},
abstractNote = {Over 50 years ago, Anderson and Blount proposed that ferroelectric-like structural phase transitions may occur in metals, despite the expected screening of the Coulomb interactions that often drive polar transitions. Recently, theoretical treatments have suggested that such transitions require the itinerant electrons be decoupled from the soft transverse optical phonons responsible for polar order. However, this decoupled electron mechanism (DEM) has yet to be experimentally observed. Here we utilize ultrafast spectroscopy to uncover evidence of the DEM in LiOsO3, the first known band metal to undergo a thermally driven polar phase transition (Tc ≈ 140 K). We demonstrate that intra-band photo-carriers relax by selectively coupling to only a subset of the phonon spectrum, leaving as much as 60% of the lattice heat capacity decoupled. This decoupled heat capacity is shown to be consistent with a previously undetected and partially displacive TO polar mode, indicating the DEM in LiOsO3.},
doi = {10.1038/s41467-019-11172-2},
journal = {Nature Communications},
number = 1,
volume = 10,
place = {United Kingdom},
year = {2019},
month = {7}
}
https://doi.org/10.1038/s41467-019-11172-2
Web of Science
Works referenced in this record:
A ferroelectric-like structural transition in a metal
journal, September 2013
- Shi, Youguo; Guo, Yanfeng; Wang, Xia
- Nature Materials, Vol. 12, Issue 11
Ultrafast Electron Relaxation in Superconducting by Time-Resolved Photoelectron Spectroscopy
journal, November 2007
- Perfetti, L.; Loukakos, P. A.; Lisowski, M.
- Physical Review Letters, Vol. 99, Issue 19
Crystal stability and the theory of ferroelectricity
journal, October 1960
- Cochran, W.
- Advances in Physics, Vol. 9, Issue 36
Electronic correlations in the ferroelectric metallic state of
journal, April 2016
- Lo Vecchio, I.; Giovannetti, G.; Autore, M.
- Physical Review B, Vol. 93, Issue 16
Electron-phonon coupling and electron heat capacity of metals under conditions of strong electron-phonon nonequilibrium
journal, February 2008
- Lin, Zhibin; Zhigilei, Leonid V.; Celli, Vittorio
- Physical Review B, Vol. 77, Issue 7
Polar metals by geometric design
journal, April 2016
- Kim, T. H.; Puggioni, D.; Yuan, Y.
- Nature, Vol. 533, Issue 7601
Theory of thermal relaxation of electrons in metals
journal, September 1987
- Allen, Philip B.
- Physical Review Letters, Vol. 59, Issue 13
Femtosecond room-temperature measurement of the electron-phonon coupling constant γ in metallic superconductors
journal, April 1990
- Brorson, S. D.; Kazeroonian, A.; Moodera, J. S.
- Physical Review Letters, Vol. 64, Issue 18
Ultrafast transient response and electron-phonon coupling in the iron-pnictide superconductor
journal, July 2010
- Mansart, B.; Boschetto, D.; Savoia, A.
- Physical Review B, Vol. 82, Issue 2
Origin of polar distortion in -type “ferroelectric” metals: Role of -site instability and short-range interactions
journal, September 2014
- Xiang, H. J.
- Physical Review B, Vol. 90, Issue 9
Gap-Dependent Quasiparticle Dynamics and Coherent Acoustic Phonons in CaFe 2 As 2 across Spin Density Wave Phase Transition
journal, April 2013
- Kumar, Sunil; Harnagea, Luminita; Wurmehl, Sabine
- Journal of the Physical Society of Japan, Vol. 82, Issue 4
Ultrafast optical spectroscopy of strongly correlated materials and high-temperature superconductors: a non-equilibrium approach
journal, March 2016
- Giannetti, Claudio; Capone, Massimo; Fausti, Daniele
- Advances in Physics, Vol. 65, Issue 2
A neutron powder investigation of the high-temperature structure and phase transition in LiNbO 3
journal, August 1994
- Boysen, H.; Altorfer, F.
- Acta Crystallographica Section B Structural Science, Vol. 50, Issue 4
Spin-lattice-electron dynamics simulations of magnetic materials
journal, May 2012
- Ma, Pui-Wai; Dudarev, S. L.; Woo, C. H.
- Physical Review B, Vol. 85, Issue 18
‘Ferroelectric’ metals reexamined: fundamental mechanisms and design considerations for new materials
journal, January 2016
- Benedek, Nicole A.; Birol, Turan
- Journal of Materials Chemistry C, Vol. 4, Issue 18
Electron-phonon interactions from first principles
journal, February 2017
- Giustino, Feliciano
- Reviews of Modern Physics, Vol. 89, Issue 1
Designing a robustly metallic noncenstrosymmetric ruthenate oxide with large thermopower anisotropy
journal, March 2014
- Puggioni, Danilo; Rondinelli, James M.
- Nature Communications, Vol. 5, Issue 1